From 047fc8a1f9a6330eacc80374dff087e20dc2304b Mon Sep 17 00:00:00 2001 From: Ross Zwisler Date: Thu, 25 Jun 2015 04:21:02 -0400 Subject: libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory The libnvdimm implementation handles allocating dimm address space (DPA) between PMEM and BLK mode interfaces. After DPA has been allocated from a BLK-region to a BLK-namespace the nd_blk driver attaches to handle I/O as a struct bio based block device. Unlike PMEM, BLK is required to handle platform specific details like mmio register formats and memory controller interleave. For this reason the libnvdimm generic nd_blk driver calls back into the bus provider to carry out the I/O. This initial implementation handles the BLK interface defined by the ACPI 6 NFIT [1] and the NVDIMM DSM Interface Example [2] composed from DCR (dimm control region), BDW (block data window), IDT (interleave descriptor) NFIT structures and the hardware register format. [1]: http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf [2]: http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf Cc: Andy Lutomirski Cc: Boaz Harrosh Cc: H. Peter Anvin Cc: Jens Axboe Cc: Ingo Molnar Cc: Christoph Hellwig Signed-off-by: Ross Zwisler Acked-by: Rafael J. Wysocki Signed-off-by: Dan Williams --- drivers/nvdimm/Kconfig | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'drivers/nvdimm/Kconfig') diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig index 204ee0796411..72226acb5c0f 100644 --- a/drivers/nvdimm/Kconfig +++ b/drivers/nvdimm/Kconfig @@ -34,6 +34,19 @@ config BLK_DEV_PMEM Say Y if you want to use an NVDIMM +config ND_BLK + tristate "BLK: Block data window (aperture) device support" + default LIBNVDIMM + select ND_BTT if BTT + help + Support NVDIMMs, or other devices, that implement a BLK-mode + access capability. BLK-mode access uses memory-mapped-i/o + apertures to access persistent media. + + Say Y if your platform firmware emits an ACPI.NFIT table + (CONFIG_ACPI_NFIT), or otherwise exposes BLK-mode + capabilities. + config ND_BTT tristate -- cgit v1.2.3